When clicking on one or more sample(s) of a sf2 file in the tree, the editing page of the samples appears.
This page is divided into several parts:
- a graph representing the sample,
- an information area,
- an analyze of frequencies,
- an equalizer,
- a sample player.
The graph allows the visualization of the sound wave. It is possible to zoom vertically or horizontally by holding a right mouse click and dragging:
- dragging right expands the horizontal axis,
- dragging left contracts the horizontal axis,
- dragging up expands the vertical axis,
- dragging down contracts the vertical axis.
Holding the left mouse button allows a horizontal move of the graph, if the horizontal axis has been expanded.
A green vertical bar indicates the start position of the loop (changeable by left click), a red bar indicates the position of the end of the loop (changeable by right click). A dotted line representing a wave portion is associated with each vertical bar, allowing us to visualize the superimposition of the beginning and the end of the loop.
During playback, a white vertical bar runs across the graph and indicates the playback position in real time.
Note: graph colors are editable in the software preferences.
The section "Information"
The section "Information" allows the editing of the following information:
- start and end of the loop,
- root key of the sample,
- correction to be applied for the sound to be tuned in the equal temperament,
- sound sample rate (a change will cause re-sampling),
- sound type (not linked: mono, otherwise left, right or linked),
- the linked sample if the sample is stereo.
In addition, the sample size in samples (number of values) and seconds is shown.
A button automatically edits the start and end of the loop so that the loop is the entire sample. Another button automatically edits the root key and the correction so that they match with the evaluation of the frequency.
The frequency analysis includes a Fourier transform (graph showing the intensity of frequencies present in the signal). On the right is shown the list of dominant peaks with the following information:
- ratio between the peak intensity and the intensity of the maximum peak,
- corresponding key,
From these data an estimate of the pitch of the sound is made. This estimate can be used for tuning.
An export of the graph into a png image is possible by using the contextual menu of the graph (right click). A tool is also available to export peak information of all samples.
The equalizer makes it possible to increase or decrease certain frequencies, from -15 to 15 dB. The effect is applied after pressing the "Apply" button. Pressing "reset" resets all the buttons to 0 dB (but does not remove the effect on the sound: for that use the "undo" button in the "Edit" menu).
Any change on a stereo sample may be automatically applied on the linked sample if the option is checked in the preferences.
The player plays the sound. During playback, a white cursor traverses the graph to indicate the playback position. Playback options are:
Plays the sound loop if the beginning and end of the loop are completed.
Plays the sample in stereo, with its linked sample. If looping is required, the two respective loops are used (they can be different).
A sinus calibration is added to the sound, allowing a sample tuning to the nearest pitch hundredth. At first the root key must be filled. At this level, beats can be heard if the frequency of the sinus differs slightly from the fundamental frequency of the sound. It remains to finely adjust the correction to make the beats as slow as possible, so that the sample is tuned at best.
If a playback is in progress when switching from one sample to another through the tree, it automatically restarts. Also, pressing the key "space" enables or disables playback if we are navigating in the tree.